Pavel V. Kovyazin, Olesya V. Mukhamadeeva, Denis N. Islamov, Lyudmila V. Parfenova
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引用次数: 0
摘要
以光学活性(R)-3-环己烯羧酸为模板与(AlMe3)2反应，合成了稳定的加合物Me2Al(µ-O-CMe2C6H9)(µ-Me)AlMe2和甲基铝氧烷（MAO）。实验证明，在锆烯类（Cp2ZrCl2、Ind2ZrCl2、raс-EB[THI]ZrCl2）催化下，所获得的 MAO 在 1-己烯二聚和低聚反应中的活性与商用 MMAO-12 相当。在催化体系中使用手性模板 MAO 能显著改变反应的立体选择性。因此，低聚过程的立体选择性会受到活化剂结构的影响，这突出了在烯插入催化活性位点时考虑活化剂反离子的重要性。
Chiral templated synthesis of methylalumoxane and its catalytic properties in alkene oligomerization
Using optically active (R)-3-cyclohexenecarboxylic acid as a template in the reaction with (AlMe3)2, the stable adduct Me2Al(µ-O-CMe2C6H9)(µ-Me)AlMe2 and methylaluminoxane (MAO) were synthesized. It is demonstrated that the activity of obtained MAO in the reaction of 1-hexene di- and oligomerization, catalyzed with zirconocenes (Cp2ZrCl2, Ind2ZrCl2, raс-EB[THI]ZrCl2), is comparable with commercial MMAO-12. The use of chiral templated MAO in a catalytic system provides a significant change in the stereoselectivity of the reaction. Therefore, the stereoselectivity of the oligomerization process can be influenced by the activator structure, underscoring the importance of taking into account the activator counterion during the alkene insertion into the catalytically active sites.
期刊介绍：
The Journal of Organometallic Chemistry targets original papers dealing with theoretical aspects, structural chemistry, synthesis, physical and chemical properties (including reaction mechanisms), and practical applications of organometallic compounds.
Organometallic compounds are defined as compounds that contain metal - carbon bonds. The term metal includes all alkali and alkaline earth metals, all transition metals and the lanthanides and actinides in the Periodic Table. Metalloids including the elements in Group 13 and the heavier members of the Groups 14 - 16 are also included. The term chemistry includes syntheses, characterizations and reaction chemistry of all such compounds. Research reports based on use of organometallic complexes in bioorganometallic chemistry, medicine, material sciences, homogeneous catalysis and energy conversion are also welcome.
The scope of the journal has been enlarged to encompass important research on organometallic complexes in bioorganometallic chemistry and material sciences, and of heavier main group elements in organometallic chemistry. The journal also publishes review articles, short communications and notes.
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